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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf73d42720be9e1617f88fa6ed283b3b12bc4b350ee646d48aed1d51e9f3bd3a' 
  AND token = 'nOc2IJ+79jRt3N/6Huw8MRiazv00Y/6ztA5mp4s5QJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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