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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64025f05c7861b965b4e9f5ca0d2d217f1b70cec2ca1ddd5fe9cb685d6e81cf3' 
  AND token = 'cNO8SOdIz+WyWkBA8ObCAGjR2kZSsiTgzmfdg/Bio8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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