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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9932e9c9ccf987391c65fa01905fb7c477f145ee6326b3f9ecc689b74fa35235' 
  AND token = 'wkzah/UUBeIZWf8sAT4Amiz/VZIa6zLk6QPoE4pcmOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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