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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '146d93046a7e1255dd0d22de75d9beeaa5a58cbc34c7b4d2ae63678fceaf59e2' 
  AND token = 'gwD5u6+3X5WpuZJ/n7JsCbjYcpWlHbTK+CK59P+WjiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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