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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ea2033f65f254a411e90afb7f571fc78eece26a4f5cebf8c27aeeb51b4e4295' 
  AND token = '/iwzk7dvRIsrnZrCR7Kmjhheaj4Ak1yhlQkRp6YXNOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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