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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba7c22fd94bf16a6dffdcfb5f00f86acc43a6d6d600122b1e96df642dd11ca35' 
  AND token = 'Rvt/eSnrh7mXWV69/J6LXqrGbLfaSncGk2doRHud/gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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