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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fe3c62fe3938e9e8f1f1dbfebd5ed5bae5310e32581a7c5e0610d8b8ed732fb' 
  AND token = 'YT95jO8c76ybo023W0JgxQx2zXmd50cpq61MJ2SzzE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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