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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec52a13101cbeddb07ccfee6caf44f47b02aff149b0cc14781d6f5373a825944' 
  AND token = 'NaMC1x3Muo+k4E/n1QU+pJqNwJOBml4JtlUQW//Trys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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