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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47c02f3bf00164a81dc43e00f3b9e654dcf9dfbe2edd469e97fedaa4f59784e6' 
  AND token = 'XRpinSYRSrAbLy9uISxHyAOBYcpVjhC03LPwGxWJA88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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