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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed672cb176008e60ecaa2fd0d58c05d41bfea198eea8ae9b019ed945f255d69f' 
  AND token = 'OZNGW+C3e+CzeapKVnrAx9mmzhan9yeKQKDlsphm+D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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