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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd83bcde0621dd7b9497ec6af17bd56f61578cd7ea1c6d2a71a724e17d7fba534' 
  AND token = 'g9Flok4Vwyimr0MzvwzophpO8p0og8Fy/xQEUk9vqTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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