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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0efef76f8507c3e05d6b031dfcb7fc29565da537c30ae88e909948a28c295385' 
  AND token = '093b+S5KENlAwwY4KDwzsaHRjx6DOlVrcQa959ykbFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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