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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcdd8049af3e4c346754d0931fc174f8c787d23207ca5a6f9fc19d025e9cc18f' 
  AND token = 'VH/0mYitcFlqXQ9boEQJPoY/6WTcYbQFK5lw9daObio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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