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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12bf795a01991c6cef849ddcf1b7c5a669924ff60df76f926af9b2ad1323072c' 
  AND token = 's6aDTgdGqinYKSffe3iDb2IWAMVB1bGanuge6ghU6VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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