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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '805e15f94b344dea8a71d69e48ab9f1b097939ccc40a2fb1ffc08054d2e2fb38' 
  AND token = 'CDdr184icxoRmY0uptETJ2STrPWCb2D/tMM1FO3Q7co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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