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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f17e2abfe94e5d58f756699ee62fd1d9ce6297e902558fa9848d96cb0eaeeb7' 
  AND token = 'xvIjUptr2A6ajJ8+9yVFkfoBbvY2gZTx5mQUz7uUN+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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