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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad82f0a7b1ccab3e002ebc9ec2d056ad3f14407f401ea48adbf5e1f36a488e47' 
  AND token = '/zW53jGcnf28IATvbzLl9a8NEt3lWJT+nmBsIMnGeB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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