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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32e214a40815350af69ac9ed42f994ee89a4f5fd45a6317ccaa8ba2ae9e87513' 
  AND token = '7pNvYk7wa1KWAL20szZdPdo9O47nac/NF3vawJJmk3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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