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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62aa93814c84867e1bcbb8ee62a9ae1243d62260e97dc18e1fab8555f926c539' 
  AND token = 'Uj5cq1nH3k/6nj1OEo6z11USohT6UFE8LcM4fjuFTB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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