SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceba418995419e3873e49c7b55cbb20b0c31131e62b63cdb2f79217e24d6c8aa' 
  AND token = 'ohdVvmH0CGY1ZbbqlGOin7HbSf+A96Hwag2VdsvIlvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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