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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26c6599c43b99328e1ce3f2253d1e9adf63fdfcd83aeebdbbd1e1de63110d901' 
  AND token = 'Y9JsBZ3sTQWhbkZ6Y0w5W8snA8R4JRKWtfDpuuddZHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}