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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0e9817b5edb369bdc9382939d64e798cc91c5deeca34423ae2d7e9cc426928f' 
  AND token = 'afu1LkVc9a8dtJF09Q1daE9iqBLgQdQl349PfvjwygQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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