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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '405c2f0592e18f5fcdc1733a55b9d6582756229291021435c1206306475e5789' 
  AND token = '84+8Soe7C94fqSWP1tdb8ra7icCmL3lrda6z/CztEzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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