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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f227f575c457ab66a0d5547a826d527802229b13b1e0db2b18b6362fef697f3' 
  AND token = '+iIvsTE+71oJTxhG1Y7HyEGaCAnhbPpLPrwbhD3pseU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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