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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cd91bd13b777b9b1e9dbfa7057c708bf9f8966cbf826a73b9ab4b8e6e4cc1e2' 
  AND token = 'AWYVZCqNKx7dU/ouu9pzzeKffJHm0rjIoIMnbdkD7O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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