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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b718afee87aaa3f79bdbd5e27ea618b4e4acd9280de076e3e5cfa415251a6e5' 
  AND token = '3Xw7waSvFZBobqu+OOSgVNj8LitrMVx8IGaUMpVjoGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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