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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af7690fb2b634965174ba9d673aeb525ce1cf213088a6cedd94769be9c9f09de' 
  AND token = 'TKPt4CNu8MC6Cls3ngmRdylBkTcbmcLC1+d88Z8r0OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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