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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0d5fb9cf4fefa2e78fe5b49adff23f7ff2bcadae99c79957b5339be663c3f0f' 
  AND token = 'z9BohAzNv7/N84g2XDUj67elNzgjiU9cUBC5haYXNA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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