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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40344aac0a1ebd4c1ddcccb450d1fe923a6b302914975ac001fb0995bcf6e0bf' 
  AND token = '+5DjP+bfa7yXhJ2SAMR7hirbFK9pCNNMNFPyXwY83rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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