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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7539afd3122cf5e71b6d26da25fd34b7188815fb0fc5e5fd72fe5f975bd60a5f' 
  AND token = 'B285WVw2nNjNxmubph923QJGObVYKD4iIMYaldwK9Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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