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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62b7fd7ea971b1b0203c58e1b76ef8fcbb7b767f7f76bb31edb6eb91cab6c33c' 
  AND token = 'zn/BI1nZDMATga6K5tEKDAoHyX6uNONRcGVpF4xCn58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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