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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11051e34d6d7733c59ed57ae47b01023512510680cb50b9f636a6300289906d5' 
  AND token = '0R7tKNRZiy2sKWzZV9lcJ0UuQ7jVyvuvhEUtNNm65fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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