SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acfffa3817daa1ca6763846839067e53c4237c6b4475db471be945b0af4f1309' 
  AND token = 'cRyB3RdHLCYJ+U2ziCu0GqQMC13Kas5qtYKwiCaEM+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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