SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66b80e680e1bd940a7e709c98ea318d130e692f73964a7483aa19ea7bb84f053' 
  AND token = 'QL/heMAnxKbTHXix7I/2MXBy2Vxzp+vxEzHG5TcEqfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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