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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '448c8cdb36ec94d1f7895a6ca4ece74b7d512b61549f68d81f63002bcbc57ef6' 
  AND token = 'FMKKPFdH6eTDGtNtEuxZu4K2Ry8xduqTvPK1A8E6Jfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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