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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fc079e9e542aadd8918db1524f202e4e563075ef87d60b90037e50138ca9a32' 
  AND token = 'RG8PIkBvILl9+RFrLybmdIkU7eNfz8+ySPuuXSW8rSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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