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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7079097a8f6f9091f9aea45ac7ede66963ab1a79720277278c8dae6b5e2712d7' 
  AND token = 'wR1qEcveXiJYIOtiwNn64EsBj+RhdEkL0ad9oC0HXQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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