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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff39795a74fe846f83c6779f83efc83aa16b349c022bb6fbbbfe4b71b12e8c8c' 
  AND token = 'lLTKEtbrJRCV5yhQie+SnOfcAM9y+pmk3nKj0+jtFZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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