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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a5e972adfb83b97b3ac49f092fac66a919d3dabc18c6329c6bb2125b9cc2ad8' 
  AND token = 'vYqN3m26QKUWkz7EGKvU30qkZp//iqe8pHKqy2l1X+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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