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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f5b9470c401af649d0eaf59af907441dbe01babf0f278281d7bc0c2ec74eac2' 
  AND token = '7P80SWGHx1uMC1RpNHqgFG7om9ogcDKO06x2sMtM9tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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