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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc201136460c15b315e291b5d39fea41ebe6b70b7f6839c134ec8e61e8e0d8a2' 
  AND token = 'eB3CmwQtFxJ7oBVmd8AdAb+IcqFvgBgHD5e5qfuf33E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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