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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8abc08e3c11d52418d1059483cabc7cd7bea607e60cba00f94b4421300e64b3' 
  AND token = '0kNt6VaNbkUZJd4MOojnciu6gz0a70rhjj9FBNdx7aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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