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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '203c6ae2519a4503add20eb01d048d247a7fd63526abe7d84085de8ca174dedc' 
  AND token = '+mKqI5mBT25ikKfa94l9Jzl6R/Cv7y2zzWh3BoQqFLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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