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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed3a75c6df4cfe34e782fdb910b8bfba2998b0d39ec3b8a45ad232d5fea8c686' 
  AND token = '1nW6xvpTGy5Xy8HFPr46sRo1jWZg4cKM3SWwSmqROWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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