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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd15520f49e7b76a5d2ec3ebee19bda133fd933058ea6dfd76cee40ea9879776e' 
  AND token = 'sU7NmHp10Rpbd/pb1x3FB1teHulx7Xx72tg4ajJwLeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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