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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75c91656b30a39db3de408610c4c6982f71d25127a8515a41e174292d6680602' 
  AND token = 'cx48ymcEbfFmkOqUx3Xj3b28bLcbDdiJbZwYUSgwI8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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