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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '329439380cdf8085b249e7df1d7cd557c56f240aa7371a538bc4402d987b0898' 
  AND token = '1zSX2Nls95BMHBAFmAW67FLeZPuucfn69suoRxwzmM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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