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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a885fd410b6dfb63fd25b68f95f1cfd1b072e33f53c585b86c64faa073ad303f' 
  AND token = 'SxJC8DPvvKs3dwG9S5968w6Aun4hk2QR8FzrJ4kJeT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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