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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03437a45d4295fe774f857809361bc3a98ce209334ced74df823a7565e088cd3' 
  AND token = '1uFck7+EzlHiNV9WQmXfjN9FHoBPQNC3ntSOT00/BwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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