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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59d4d68a912d08ba8bf0e43eb20af9eb797548438ec8db388ed3e8d60378e4cc' 
  AND token = '+zPKcs7tngQpI1ypz8WEsbMsuTjY27twdkGeIAIq4kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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