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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab08dee2e87bd2b40a0eec831d4b1447c4ca2386b95e23aaf5b72428f6233138' 
  AND token = '0fiAfG3NPbtySKKTaMfvmR+SJgO3skDxDuAQt1jPkcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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