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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d89ea90016011cd22d99129720cdc2111d6e31c2c86a144fc02b3c0aa097c9b' 
  AND token = 'YXsDRz6e1BT73RWXKEtn30oASt2vqr87QM7HrMWY/sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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