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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41608ddf02b85395c141a77284f12157d85d7c2ee2525c5bf28f219d7e4d07af' 
  AND token = 'khe3pDvzXkzW9ckI6fEaoAVNWmd7nekX3gS2z8VMj2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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