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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af51f533a69f56a670cb059dc736c94ea3f7e073f657790bb6dc7d2ec52643cf' 
  AND token = 'cEjXk0Kr7KJEwTV+yPm3LjRVW12o9iL6vS2sbgZI+bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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