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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9e063cfae621a84ccb093759f3e87c9893121384fde1bdc68c7bc8048397989' 
  AND token = 'HMby0uMRkYS+aWLSqqU3aMdoF/8d8YvOvY8vV5mG3pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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