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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd96ca9a7c240976081559843a562da1262e9df76f71a76eda99f17c580548e96' 
  AND token = '93FuSOy6xphwPLY7mzQP0Qt+zqPoUpDLPst59g0FpTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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