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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd170a58bf49431c273aa6103df446a7dae42c5b026f28d81108b276aedf082eb' 
  AND token = 't5ay5faq3pvo3aMRgHNJa14R02BjOK1GBUi4snZZzRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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