SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3577f462187b8d586efc41e68354041fa8c201160eaf2e2e5814dfecaf69584' 
  AND token = 'eNDFBewxIW/UuhGThvUZO3xlrijfMoybkfjl1WVUU9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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