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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f630c374b6fc309973e7bdaf20e2caf330ef0bdba7d065800c59ab589eb1817' 
  AND token = 'x6SMipQE5lNQaB3ZgyBff8eRz48pl0GGqdZA9SKgXl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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