SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1253056ddf9ff03dd648321c16e7aafc5f127609a907c04b6f46e5d279c993b' 
  AND token = 'JOWI9DjsXsCFMV+/QqobvA/gz/3fbKmaj81HdpzHK4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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